CER File Viewer Online
Open and preview .cer files (DER Certificate) directly in your browser — no downloads, no installs, no account required.
Open CER File Now →About CER Files
| Extension | .cer |
| Full Name | DER Certificate |
| MIME Type | application/x-x509-ca-cert |
| Category | 💻 Code & Markup |
| Processing | 🔒 In-browser (private) |
How to Open CER Files Online
- Visit ViewAnyFile.app
Go to ViewAnyFile.app in any web browser.
- Upload your CER file
Drag and drop your
.cerfile, or click to browse. - View instantly
Your file renders immediately. It stays in your browser — nothing is uploaded.
Frequently Asked Questions
How do I open a CER file online?
Visit ViewAnyFile.app and drag your .cer file into the upload area. It renders instantly — no download or account needed.
Is it safe to open CER files on ViewAnyFile.app?
Yes. All processing for CER files happens entirely inside your browser. Your files never leave your device and are never uploaded to any server.
Can I open CER files on Mac and mobile?
Yes. ViewAnyFile.app works in any modern browser on Windows, macOS, Linux, iPhone (Safari), and Android (Chrome). No operating system restrictions.
Do I need to create an account?
No. ViewAnyFile.app is 100% free with no signup required. Just drag, drop, and view.